Schumpeter, who came of age in the Vienna of Sigmund Freud, once declared his ambition to become Europe's greatest lover and greatest horseman, "and perhaps also its greatest economist." (Later he said coyly he'd achieved two out of three.) In 1932, he left Europe for Harvard. There he argued that it's entrepreneurs who drive economies, generating growth and, through successes and failures, setting business cycles in motion - a provocative claim in the '30s, when capitalism seemed bankrupt. Even after publishing his landmark Capitalism, Socialism, and Democracy in 1942, Schumpeter was overshadowed by John Maynard Keynes, who preached government spending as a way out of the Depression. "Schumpeter probably was right all along," says Michael Powell, "but it's only now, at Moore's law speed, that you can actually observe it.